| DEG | differentially expressed gene |
| ECR | extracellular region |
| GO | Gene Ontology |
| KEGG | Kyoto Encyclopedia of Genes and Genomes |
| MTg | tegmental region of the midbrain |
| PAG | periaqueductal gray matter |
| PCA | principal component analysis |
| PC1 | first principal component |
| PC2 | second principal component |
| TF | transcription factor |
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